The opening of the world’s tallest water slide at the Schlitterbahn water park in Kansas City, Kan., has been delayed to allow more testing.

The Verrückt, which means “insane” in German, is now targeted to open June 5 instead of May 23, when the rest of the water park opens.

“It’s a one-of-a-kind attraction, and there is a one-of-a-kind process for getting it ready,” said Layne Pitcher, marketing director for Schlitterbahn, which is near Kansas Speedway.

Pitcher said adjustments were still being made to the slide, which is 168 feet and 7 inches tall. It was certified in April as the world’s tallest by Guinness World Records. Riders will plummet at 60 to 70 mph in a four-person raft.